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how to create errors on floppy disks
From: |
Buciuman Adrian |
Subject: |
how to create errors on floppy disks |
Date: |
Thu, 13 May 2004 19:12:46 +0300 |
Can fdutils be used to make some sectors ( but not all ) on a floppydisk
unreadable ( i.e. give an I/O error when read from /dev/fd0 ) ?
This can be used to test and debug dd and maybe other utilities ( for
data recovery etc )
The noerror option of dd is ( was ?? ) buggy under some conditions , but
is is imposible to reproduce/debug/test without broken disks.
I don't know much about the low-level structure of floppy disks but I
hope
that something like : CRC errors , sectors with unexpected lenght , sectors
with unexpected numbers , sectors spacing errors can be created by
software.
Using different formats for tracks may be a quicker solution , but it
will be
nice ( and better for debuging ) to be able to make individual sectors
unreadable.
For more details on the dd bug see this :
http://mail.gnu.org/archive/html/bug-coreutils/2003-08/threads.html#00105
http://mail.gnu.org/archive/html/bug-coreutils/2003-09/threads.html#00099
http://mail.gnu.org/archive/html/bug-coreutils/2003-10/threads.html#00069
- how to create errors on floppy disks,
Buciuman Adrian <=